Firewall/NAT

Hello All,
On my case that need to remote manageGUI on wan interface.
Here is my diagram concept.

We have 3 interfaces but i'm real use two interfaces.(wan,opt)

 wan(192.168.0.250)-----opt(bridge as wan)-------LAN(192.168.1.1)

So in wan is connected from internet.
and OPT is config bridge as WAN and plug to one server that have same range ip of wan (eg.192.168.0.251)

For LAN im not use if it can remote manage GUI on WAN IP.I'll disable LAN interface.

My concept need to protect with bridge mode and access manage m0n0wall with wan interface rather than LAN interface.

As now How i remote form outside to manage m0n0wall GUI to (192.168.0.250) with (http://192.168.0.250)??



Thanks.
Bancha.